: today, the first state in the nation has legalized marijuana for recreational use, leaving cops and citizens with lots of questions. john blackstone clears the air. and what town has the winningest football team in the nation? wyatt andrews takes us to a community on hard times now riding high. >> one, two, three. captioning sponsored by cbs this is the "cbs evening news" with scott pelley. >> pelley: good evening. whether the u.s. enters the war in syria appears to be up to the dictator bashar al-assad. on monday, david martin reported that the assad regime had given orders to prepare chemical weapons for possible use to put down the revolt that has been raging in that country for more than a year and a half. president obama said the use of these weapons of mass destruction would be totally unacceptable. well, tonight, david has new intelligence to report, and we have three stories on the breaking news in syria. we'll start with martin at the pentagon. >> reporter: u.s. intelligence so far has not detected any signs syria is loading chemical weapons on to aircraft, but defense secr